If you already own an iPhone 3GS, 4 or 4S, you’re about to feel like you just bought a new smartphone without spending a dime. On September 19, Apple releases the operating system iOS 6, which isn’t just any old software upgrade — it’s a quantum leap forward.

iOS 6 adds a lot of fun new stuff, such as Facebook and Twitter integration that lets you post from anywhere in your phone, and the new Maps app (a replacement for Google Maps, which you’ll likely have to download again separately).